Android Question AdMob's not showing on phone

Hi to all,

I've spent several days reading the existing posts about AdMob, other webs (http://ofimatica-programacion.blogspot.com.es/2014/05/basic4android-11-monetizar-aplicacion.html) and praying Manitu and all the gods of any antique civilization but i can't get AdMob working.

Thanks to all that information i've got to the point where, on emulator, i can see:
Nice job! You're displaying a 320 test ad from AdMob
But, when i install it on my phone in order to see its behaviour on a real one, nothing is displayed.

Only banners show this way, interstitial is missing in both devices.

Logs in emulator

** Service (starter) Create **
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **receivedreceived
failed: 2failed: 2
received
received
failed: 2
failed: 2

Although i don't give it much importance because of the received ones.

I don't know what can be the problem, maybe it's internet access, if the phone doesn't allow the app to get to internet, no ad can be shown, but this is weird because i've given it access in Manifest file.

AddManifestText(
<uses-sdk android:minSdkVersion="5" android:targetSdkVersion="14"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<supports-screens android:largeScreens="true"
android:normalScreens="true"
android:smallScreens="true"
android:anyDensity="true"/>)

Click to expand...

Can anyone help me? Thanks in advance.